Hi Czary!!
You make a good job!!
Don't worry, I think you will solve the centering problem.
Mine is working pretty well!!
I strongly believe that your trobble is that you use the cam system as a scissors (at least is what the result appearing to be in the picures), which, by my intuition, is not good.
Try to make they work as a valley. Look the pictures in this link:
baur cam pedal